/*
 ***************************************************************************************
 *  Copyright (C) 2006 EsperTech, Inc. All rights reserved.                            *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 ***************************************************************************************
 */
package com.espertech.esper.common.internal.filterspec;

import com.espertech.esper.common.client.EventBean;
import com.espertech.esper.common.internal.epl.expression.core.ExprEvaluatorContext;
import com.espertech.esper.common.internal.epl.variable.core.VariableManagementService;

/**
 * Adapter to evaluate boolean expressions, providing
 * events per stream to expression nodes. Generated by @{link FilterSpecParamExprNode} for
 * boolean expression filter parameters.
 */
public final class ExprNodeAdapterMSPlain extends ExprNodeAdapterMSBase {
    private final VariableManagementService variableService;
    private final ThreadLocal<EventBean[]> arrayPerThread;

    public ExprNodeAdapterMSPlain(FilterSpecParamExprNode factory, ExprEvaluatorContext evaluatorContext, EventBean[] prototype, VariableManagementService variableService) {
        super(factory, evaluatorContext, prototype);
        this.variableService = variableService;

        arrayPerThread = new ThreadLocal<EventBean[]>() {
            protected synchronized EventBean[] initialValue() {
                EventBean[] eventsPerStream = new EventBean[prototypeArray.length];
                System.arraycopy(prototypeArray, 0, eventsPerStream, 0, prototypeArray.length);
                return eventsPerStream;
            }
        };
    }

    public boolean evaluate(EventBean theEvent) {
        if (variableService != null) {
            variableService.setLocalVersion();
        }
        EventBean[] eventsPerStream = arrayPerThread.get();
        eventsPerStream[0] = theEvent;
        return evaluatePerStream(eventsPerStream);
    }
}
